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| author | Stanislav Fomichev <sdf@google.com> | 2022-06-28 20:43:07 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-06-29 23:21:52 +0300 |
| commit | c0e19f2c9a3edd38e4b1bdae98eb44555d02bc31 (patch) | |
| tree | b2198708a1d7ee3dccb5c7ba5d40a84643a66e28 /include/linux/bpf-cgroup-defs.h | |
| parent | 69fd337a975c7e690dfe49d9cb4fe5ba1e6db44e (diff) | |
| download | linux-c0e19f2c9a3edd38e4b1bdae98eb44555d02bc31.tar.xz | |
bpf: minimize number of allocated lsm slots per program
Previous patch adds 1:1 mapping between all 211 LSM hooks
and bpf_cgroup program array. Instead of reserving a slot per
possible hook, reserve 10 slots per cgroup for lsm programs.
Those slots are dynamically allocated on demand and reclaimed.
struct cgroup_bpf {
struct bpf_prog_array * effective[33]; /* 0 264 */
/* --- cacheline 4 boundary (256 bytes) was 8 bytes ago --- */
struct hlist_head progs[33]; /* 264 264 */
/* --- cacheline 8 boundary (512 bytes) was 16 bytes ago --- */
u8 flags[33]; /* 528 33 */
/* XXX 7 bytes hole, try to pack */
struct list_head storages; /* 568 16 */
/* --- cacheline 9 boundary (576 bytes) was 8 bytes ago --- */
struct bpf_prog_array * inactive; /* 584 8 */
struct percpu_ref refcnt; /* 592 16 */
struct work_struct release_work; /* 608 72 */
/* size: 680, cachelines: 11, members: 7 */
/* sum members: 673, holes: 1, sum holes: 7 */
/* last cacheline: 40 bytes */
};
Reviewed-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20220628174314.1216643-5-sdf@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux/bpf-cgroup-defs.h')
| -rw-r--r-- | include/linux/bpf-cgroup-defs.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/bpf-cgroup-defs.h b/include/linux/bpf-cgroup-defs.h index b99f8c3e37ea..7b121bd780eb 100644 --- a/include/linux/bpf-cgroup-defs.h +++ b/include/linux/bpf-cgroup-defs.h @@ -11,7 +11,8 @@ struct bpf_prog_array; #ifdef CONFIG_BPF_LSM -#define CGROUP_LSM_NUM 211 /* will be addressed in the next patch */ +/* Maximum number of concurrently attachable per-cgroup LSM hooks. */ +#define CGROUP_LSM_NUM 10 #else #define CGROUP_LSM_NUM 0 #endif |